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path: root/drivers/acpi/tables/tbxfroot.c
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-rw-r--r--drivers/acpi/tables/tbxfroot.c552
1 files changed, 89 insertions, 463 deletions
diff --git a/drivers/acpi/tables/tbxfroot.c b/drivers/acpi/tables/tbxfroot.c
index da2648bbdbc0..cf8fa514189f 100644
--- a/drivers/acpi/tables/tbxfroot.c
+++ b/drivers/acpi/tables/tbxfroot.c
@@ -5,7 +5,7 @@
5 *****************************************************************************/ 5 *****************************************************************************/
6 6
7/* 7/*
8 * Copyright (C) 2000 - 2006, R. Byron Moore 8 * Copyright (C) 2000 - 2007, R. Byron Moore
9 * All rights reserved. 9 * All rights reserved.
10 * 10 *
11 * Redistribution and use in source and binary forms, with or without 11 * Redistribution and use in source and binary forms, with or without
@@ -48,16 +48,15 @@
48ACPI_MODULE_NAME("tbxfroot") 48ACPI_MODULE_NAME("tbxfroot")
49 49
50/* Local prototypes */ 50/* Local prototypes */
51static acpi_status
52acpi_tb_find_rsdp(struct acpi_table_desc *table_info, u32 flags);
53
54static u8 *acpi_tb_scan_memory_for_rsdp(u8 * start_address, u32 length); 51static u8 *acpi_tb_scan_memory_for_rsdp(u8 * start_address, u32 length);
55 52
53static acpi_status acpi_tb_validate_rsdp(struct acpi_table_rsdp *rsdp);
54
56/******************************************************************************* 55/*******************************************************************************
57 * 56 *
58 * FUNCTION: acpi_tb_validate_rsdp 57 * FUNCTION: acpi_tb_validate_rsdp
59 * 58 *
60 * PARAMETERS: Rsdp - Pointer to unvalidated RSDP 59 * PARAMETERS: Rsdp - Pointer to unvalidated RSDP
61 * 60 *
62 * RETURN: Status 61 * RETURN: Status
63 * 62 *
@@ -65,14 +64,18 @@ static u8 *acpi_tb_scan_memory_for_rsdp(u8 * start_address, u32 length);
65 * 64 *
66 ******************************************************************************/ 65 ******************************************************************************/
67 66
68acpi_status acpi_tb_validate_rsdp(struct rsdp_descriptor *rsdp) 67static acpi_status acpi_tb_validate_rsdp(struct acpi_table_rsdp *rsdp)
69{ 68{
70 ACPI_FUNCTION_ENTRY(); 69 ACPI_FUNCTION_ENTRY();
71 70
72 /* 71 /*
73 * The signature and checksum must both be correct 72 * The signature and checksum must both be correct
73 *
74 * Note: Sometimes there exists more than one RSDP in memory; the valid
75 * RSDP has a valid checksum, all others have an invalid checksum.
74 */ 76 */
75 if (ACPI_STRNCMP((char *)rsdp, RSDP_SIG, sizeof(RSDP_SIG) - 1) != 0) { 77 if (ACPI_STRNCMP((char *)rsdp, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)
78 != 0) {
76 79
77 /* Nope, BAD Signature */ 80 /* Nope, BAD Signature */
78 81
@@ -81,14 +84,14 @@ acpi_status acpi_tb_validate_rsdp(struct rsdp_descriptor *rsdp)
81 84
82 /* Check the standard checksum */ 85 /* Check the standard checksum */
83 86
84 if (acpi_tb_sum_table(rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) { 87 if (acpi_tb_checksum((u8 *) rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) {
85 return (AE_BAD_CHECKSUM); 88 return (AE_BAD_CHECKSUM);
86 } 89 }
87 90
88 /* Check extended checksum if table version >= 2 */ 91 /* Check extended checksum if table version >= 2 */
89 92
90 if ((rsdp->revision >= 2) && 93 if ((rsdp->revision >= 2) &&
91 (acpi_tb_sum_table(rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0)) { 94 (acpi_tb_checksum((u8 *) rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0)) {
92 return (AE_BAD_CHECKSUM); 95 return (AE_BAD_CHECKSUM);
93 } 96 }
94 97
@@ -97,314 +100,123 @@ acpi_status acpi_tb_validate_rsdp(struct rsdp_descriptor *rsdp)
97 100
98/******************************************************************************* 101/*******************************************************************************
99 * 102 *
100 * FUNCTION: acpi_tb_find_table 103 * FUNCTION: acpi_tb_find_rsdp
101 *
102 * PARAMETERS: Signature - String with ACPI table signature
103 * oem_id - String with the table OEM ID
104 * oem_table_id - String with the OEM Table ID
105 * table_ptr - Where the table pointer is returned
106 *
107 * RETURN: Status
108 * 104 *
109 * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the 105 * PARAMETERS: table_address - Where the table pointer is returned
110 * Signature, OEM ID and OEM Table ID.
111 * 106 *
112 ******************************************************************************/ 107 * RETURN: Status, RSDP physical address
113
114acpi_status
115acpi_tb_find_table(char *signature,
116 char *oem_id,
117 char *oem_table_id, struct acpi_table_header ** table_ptr)
118{
119 acpi_status status;
120 struct acpi_table_header *table;
121
122 ACPI_FUNCTION_TRACE(tb_find_table);
123
124 /* Validate string lengths */
125
126 if ((ACPI_STRLEN(signature) > ACPI_NAME_SIZE) ||
127 (ACPI_STRLEN(oem_id) > sizeof(table->oem_id)) ||
128 (ACPI_STRLEN(oem_table_id) > sizeof(table->oem_table_id))) {
129 return_ACPI_STATUS(AE_AML_STRING_LIMIT);
130 }
131
132 if (ACPI_COMPARE_NAME(signature, DSDT_SIG)) {
133 /*
134 * The DSDT pointer is contained in the FADT, not the RSDT.
135 * This code should suffice, because the only code that would perform
136 * a "find" on the DSDT is the data_table_region() AML opcode -- in
137 * which case, the DSDT is guaranteed to be already loaded.
138 * If this becomes insufficient, the FADT will have to be found first.
139 */
140 if (!acpi_gbl_DSDT) {
141 return_ACPI_STATUS(AE_NO_ACPI_TABLES);
142 }
143 table = acpi_gbl_DSDT;
144 } else {
145 /* Find the table */
146
147 status = acpi_get_firmware_table(signature, 1,
148 ACPI_LOGICAL_ADDRESSING,
149 &table);
150 if (ACPI_FAILURE(status)) {
151 return_ACPI_STATUS(status);
152 }
153 }
154
155 /* Check oem_id and oem_table_id */
156
157 if ((oem_id[0] &&
158 ACPI_STRNCMP(oem_id, table->oem_id,
159 sizeof(table->oem_id))) ||
160 (oem_table_id[0] &&
161 ACPI_STRNCMP(oem_table_id, table->oem_table_id,
162 sizeof(table->oem_table_id)))) {
163 return_ACPI_STATUS(AE_AML_NAME_NOT_FOUND);
164 }
165
166 ACPI_DEBUG_PRINT((ACPI_DB_TABLES, "Found table [%4.4s]\n",
167 table->signature));
168
169 *table_ptr = table;
170 return_ACPI_STATUS(AE_OK);
171}
172
173/*******************************************************************************
174 *
175 * FUNCTION: acpi_get_firmware_table
176 * 108 *
177 * PARAMETERS: Signature - Any ACPI table signature 109 * DESCRIPTION: Search lower 1_mbyte of memory for the root system descriptor
178 * Instance - the non zero instance of the table, allows 110 * pointer structure. If it is found, set *RSDP to point to it.
179 * support for multiple tables of the same type
180 * Flags - Physical/Virtual support
181 * table_pointer - Where a buffer containing the table is
182 * returned
183 * 111 *
184 * RETURN: Status 112 * NOTE1: The RSDP must be either in the first 1_k of the Extended
113 * BIOS Data Area or between E0000 and FFFFF (From ACPI Spec.)
114 * Only a 32-bit physical address is necessary.
185 * 115 *
186 * DESCRIPTION: This function is called to get an ACPI table. A buffer is 116 * NOTE2: This function is always available, regardless of the
187 * allocated for the table and returned in table_pointer. 117 * initialization state of the rest of ACPI.
188 * This table will be a complete table including the header.
189 * 118 *
190 ******************************************************************************/ 119 ******************************************************************************/
191 120
192acpi_status 121acpi_status acpi_find_root_pointer(acpi_native_uint * table_address)
193acpi_get_firmware_table(acpi_string signature,
194 u32 instance,
195 u32 flags, struct acpi_table_header **table_pointer)
196{ 122{
197 acpi_status status; 123 u8 *table_ptr;
198 struct acpi_pointer address; 124 u8 *mem_rover;
199 struct acpi_table_header *header = NULL; 125 u32 physical_address;
200 struct acpi_table_desc *table_info = NULL;
201 struct acpi_table_desc *rsdt_info;
202 u32 table_count;
203 u32 i;
204 u32 j;
205
206 ACPI_FUNCTION_TRACE(acpi_get_firmware_table);
207
208 /*
209 * Ensure that at least the table manager is initialized. We don't
210 * require that the entire ACPI subsystem is up for this interface.
211 * If we have a buffer, we must have a length too
212 */
213 if ((instance == 0) || (!signature) || (!table_pointer)) {
214 return_ACPI_STATUS(AE_BAD_PARAMETER);
215 }
216
217 /* Ensure that we have a RSDP */
218
219 if (!acpi_gbl_RSDP) {
220
221 /* Get the RSDP */
222
223 status = acpi_os_get_root_pointer(flags, &address);
224 if (ACPI_FAILURE(status)) {
225 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "RSDP not found\n"));
226 return_ACPI_STATUS(AE_NO_ACPI_TABLES);
227 }
228
229 /* Map and validate the RSDP */
230
231 if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) {
232 status = acpi_os_map_memory(address.pointer.physical,
233 sizeof(struct
234 rsdp_descriptor),
235 (void *)&acpi_gbl_RSDP);
236 if (ACPI_FAILURE(status)) {
237 return_ACPI_STATUS(status);
238 }
239 } else {
240 acpi_gbl_RSDP = address.pointer.logical;
241 }
242
243 /* The RDSP signature and checksum must both be correct */
244
245 status = acpi_tb_validate_rsdp(acpi_gbl_RSDP);
246 if (ACPI_FAILURE(status)) {
247 return_ACPI_STATUS(status);
248 }
249 }
250
251 /* Get the RSDT address via the RSDP */
252
253 acpi_tb_get_rsdt_address(&address);
254 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
255 "RSDP located at %p, RSDT physical=%8.8X%8.8X\n",
256 acpi_gbl_RSDP,
257 ACPI_FORMAT_UINT64(address.pointer.value)));
258 126
259 /* Insert processor_mode flags */ 127 ACPI_FUNCTION_TRACE(acpi_find_root_pointer);
260 128
261 address.pointer_type |= flags; 129 /* 1a) Get the location of the Extended BIOS Data Area (EBDA) */
262 130
263 /* Get and validate the RSDT */ 131 table_ptr = acpi_os_map_memory((acpi_physical_address)
132 ACPI_EBDA_PTR_LOCATION,
133 ACPI_EBDA_PTR_LENGTH);
134 if (!table_ptr) {
135 ACPI_ERROR((AE_INFO,
136 "Could not map memory at %8.8X for length %X",
137 ACPI_EBDA_PTR_LOCATION, ACPI_EBDA_PTR_LENGTH));
264 138
265 rsdt_info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_table_desc));
266 if (!rsdt_info) {
267 return_ACPI_STATUS(AE_NO_MEMORY); 139 return_ACPI_STATUS(AE_NO_MEMORY);
268 } 140 }
269 141
270 status = acpi_tb_get_table(&address, rsdt_info); 142 ACPI_MOVE_16_TO_32(&physical_address, table_ptr);
271 if (ACPI_FAILURE(status)) {
272 goto cleanup;
273 }
274
275 status = acpi_tb_validate_rsdt(rsdt_info->pointer);
276 if (ACPI_FAILURE(status)) {
277 goto cleanup;
278 }
279 143
280 /* Allocate a scratch table header and table descriptor */ 144 /* Convert segment part to physical address */
281 145
282 header = ACPI_ALLOCATE(sizeof(struct acpi_table_header)); 146 physical_address <<= 4;
283 if (!header) { 147 acpi_os_unmap_memory(table_ptr, ACPI_EBDA_PTR_LENGTH);
284 status = AE_NO_MEMORY;
285 goto cleanup;
286 }
287 148
288 table_info = ACPI_ALLOCATE(sizeof(struct acpi_table_desc)); 149 /* EBDA present? */
289 if (!table_info) {
290 status = AE_NO_MEMORY;
291 goto cleanup;
292 }
293 150
294 /* Get the number of table pointers within the RSDT */ 151 if (physical_address > 0x400) {
295
296 table_count =
297 acpi_tb_get_table_count(acpi_gbl_RSDP, rsdt_info->pointer);
298 address.pointer_type = acpi_gbl_table_flags | flags;
299
300 /*
301 * Search the RSDT/XSDT for the correct instance of the
302 * requested table
303 */
304 for (i = 0, j = 0; i < table_count; i++) {
305 /* 152 /*
306 * Get the next table pointer, handle RSDT vs. XSDT 153 * 1b) Search EBDA paragraphs (EBDA is required to be a
307 * RSDT pointers are 32 bits, XSDT pointers are 64 bits 154 * minimum of 1_k length)
308 */ 155 */
309 if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) { 156 table_ptr = acpi_os_map_memory((acpi_native_uint)
310 address.pointer.value = 157 physical_address,
311 (ACPI_CAST_PTR 158 ACPI_EBDA_WINDOW_SIZE);
312 (struct rsdt_descriptor, 159 if (!table_ptr) {
313 rsdt_info->pointer))->table_offset_entry[i]; 160 ACPI_ERROR((AE_INFO,
314 } else { 161 "Could not map memory at %8.8X for length %X",
315 address.pointer.value = 162 physical_address, ACPI_EBDA_WINDOW_SIZE));
316 (ACPI_CAST_PTR
317 (struct xsdt_descriptor,
318 rsdt_info->pointer))->table_offset_entry[i];
319 }
320
321 /* Get the table header */
322 163
323 status = acpi_tb_get_table_header(&address, header); 164 return_ACPI_STATUS(AE_NO_MEMORY);
324 if (ACPI_FAILURE(status)) {
325 goto cleanup;
326 } 165 }
327 166
328 /* Compare table signatures and table instance */ 167 mem_rover =
329 168 acpi_tb_scan_memory_for_rsdp(table_ptr,
330 if (ACPI_COMPARE_NAME(header->signature, signature)) { 169 ACPI_EBDA_WINDOW_SIZE);
331 170 acpi_os_unmap_memory(table_ptr, ACPI_EBDA_WINDOW_SIZE);
332 /* An instance of the table was found */
333 171
334 j++; 172 if (mem_rover) {
335 if (j >= instance) {
336 173
337 /* Found the correct instance, get the entire table */ 174 /* Return the physical address */
338 175
339 status = 176 physical_address +=
340 acpi_tb_get_table_body(&address, header, 177 (u32) ACPI_PTR_DIFF(mem_rover, table_ptr);
341 table_info);
342 if (ACPI_FAILURE(status)) {
343 goto cleanup;
344 }
345 178
346 *table_pointer = table_info->pointer; 179 *table_address = physical_address;
347 goto cleanup; 180 return_ACPI_STATUS(AE_OK);
348 }
349 } 181 }
350 } 182 }
351 183
352 /* Did not find the table */ 184 /*
185 * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh
186 */
187 table_ptr = acpi_os_map_memory((acpi_physical_address)
188 ACPI_HI_RSDP_WINDOW_BASE,
189 ACPI_HI_RSDP_WINDOW_SIZE);
353 190
354 status = AE_NOT_EXIST; 191 if (!table_ptr) {
192 ACPI_ERROR((AE_INFO,
193 "Could not map memory at %8.8X for length %X",
194 ACPI_HI_RSDP_WINDOW_BASE,
195 ACPI_HI_RSDP_WINDOW_SIZE));
355 196
356 cleanup: 197 return_ACPI_STATUS(AE_NO_MEMORY);
357 if (rsdt_info->pointer) {
358 acpi_os_unmap_memory(rsdt_info->pointer,
359 (acpi_size) rsdt_info->pointer->length);
360 } 198 }
361 ACPI_FREE(rsdt_info);
362 199
363 if (header) { 200 mem_rover =
364 ACPI_FREE(header); 201 acpi_tb_scan_memory_for_rsdp(table_ptr, ACPI_HI_RSDP_WINDOW_SIZE);
365 } 202 acpi_os_unmap_memory(table_ptr, ACPI_HI_RSDP_WINDOW_SIZE);
366 if (table_info) {
367 ACPI_FREE(table_info);
368 }
369 return_ACPI_STATUS(status);
370}
371 203
372ACPI_EXPORT_SYMBOL(acpi_get_firmware_table) 204 if (mem_rover) {
373 205
374/* TBD: Move to a new file */ 206 /* Return the physical address */
375#if ACPI_MACHINE_WIDTH != 16
376/*******************************************************************************
377 *
378 * FUNCTION: acpi_find_root_pointer
379 *
380 * PARAMETERS: Flags - Logical/Physical addressing
381 * rsdp_address - Where to place the RSDP address
382 *
383 * RETURN: Status, Physical address of the RSDP
384 *
385 * DESCRIPTION: Find the RSDP
386 *
387 ******************************************************************************/
388acpi_status acpi_find_root_pointer(u32 flags, struct acpi_pointer *rsdp_address)
389{
390 struct acpi_table_desc table_info;
391 acpi_status status;
392
393 ACPI_FUNCTION_TRACE(acpi_find_root_pointer);
394
395 /* Get the RSDP */
396 207
397 status = acpi_tb_find_rsdp(&table_info, flags); 208 physical_address = (u32)
398 if (ACPI_FAILURE(status)) { 209 (ACPI_HI_RSDP_WINDOW_BASE +
399 ACPI_EXCEPTION((AE_INFO, status, 210 ACPI_PTR_DIFF(mem_rover, table_ptr));
400 "RSDP structure not found - Flags=%X", flags));
401 211
402 return_ACPI_STATUS(AE_NO_ACPI_TABLES); 212 *table_address = physical_address;
213 return_ACPI_STATUS(AE_OK);
403 } 214 }
404 215
405 rsdp_address->pointer_type = ACPI_PHYSICAL_POINTER; 216 /* A valid RSDP was not found */
406 rsdp_address->pointer.physical = table_info.physical_address; 217
407 return_ACPI_STATUS(AE_OK); 218 ACPI_ERROR((AE_INFO, "A valid RSDP was not found"));
219 return_ACPI_STATUS(AE_NOT_FOUND);
408} 220}
409 221
410ACPI_EXPORT_SYMBOL(acpi_find_root_pointer) 222ACPI_EXPORT_SYMBOL(acpi_find_root_pointer)
@@ -440,7 +252,7 @@ static u8 *acpi_tb_scan_memory_for_rsdp(u8 * start_address, u32 length)
440 252
441 status = 253 status =
442 acpi_tb_validate_rsdp(ACPI_CAST_PTR 254 acpi_tb_validate_rsdp(ACPI_CAST_PTR
443 (struct rsdp_descriptor, mem_rover)); 255 (struct acpi_table_rsdp, mem_rover));
444 if (ACPI_SUCCESS(status)) { 256 if (ACPI_SUCCESS(status)) {
445 257
446 /* Sig and checksum valid, we have found a real RSDP */ 258 /* Sig and checksum valid, we have found a real RSDP */
@@ -461,189 +273,3 @@ static u8 *acpi_tb_scan_memory_for_rsdp(u8 * start_address, u32 length)
461 start_address)); 273 start_address));
462 return_PTR(NULL); 274 return_PTR(NULL);
463} 275}
464
465/*******************************************************************************
466 *
467 * FUNCTION: acpi_tb_find_rsdp
468 *
469 * PARAMETERS: table_info - Where the table info is returned
470 * Flags - Current memory mode (logical vs.
471 * physical addressing)
472 *
473 * RETURN: Status, RSDP physical address
474 *
475 * DESCRIPTION: Search lower 1_mbyte of memory for the root system descriptor
476 * pointer structure. If it is found, set *RSDP to point to it.
477 *
478 * NOTE1: The RSDP must be either in the first 1_k of the Extended
479 * BIOS Data Area or between E0000 and FFFFF (From ACPI Spec.)
480 * Only a 32-bit physical address is necessary.
481 *
482 * NOTE2: This function is always available, regardless of the
483 * initialization state of the rest of ACPI.
484 *
485 ******************************************************************************/
486
487static acpi_status
488acpi_tb_find_rsdp(struct acpi_table_desc *table_info, u32 flags)
489{
490 u8 *table_ptr;
491 u8 *mem_rover;
492 u32 physical_address;
493 acpi_status status;
494
495 ACPI_FUNCTION_TRACE(tb_find_rsdp);
496
497 /*
498 * Scan supports either logical addressing or physical addressing
499 */
500 if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) {
501
502 /* 1a) Get the location of the Extended BIOS Data Area (EBDA) */
503
504 status = acpi_os_map_memory((acpi_physical_address)
505 ACPI_EBDA_PTR_LOCATION,
506 ACPI_EBDA_PTR_LENGTH,
507 (void *)&table_ptr);
508 if (ACPI_FAILURE(status)) {
509 ACPI_ERROR((AE_INFO,
510 "Could not map memory at %8.8X for length %X",
511 ACPI_EBDA_PTR_LOCATION,
512 ACPI_EBDA_PTR_LENGTH));
513
514 return_ACPI_STATUS(status);
515 }
516
517 ACPI_MOVE_16_TO_32(&physical_address, table_ptr);
518
519 /* Convert segment part to physical address */
520
521 physical_address <<= 4;
522 acpi_os_unmap_memory(table_ptr, ACPI_EBDA_PTR_LENGTH);
523
524 /* EBDA present? */
525
526 if (physical_address > 0x400) {
527 /*
528 * 1b) Search EBDA paragraphs (EBDA is required to be a
529 * minimum of 1_k length)
530 */
531 status = acpi_os_map_memory((acpi_physical_address)
532 physical_address,
533 ACPI_EBDA_WINDOW_SIZE,
534 (void *)&table_ptr);
535 if (ACPI_FAILURE(status)) {
536 ACPI_ERROR((AE_INFO,
537 "Could not map memory at %8.8X for length %X",
538 physical_address,
539 ACPI_EBDA_WINDOW_SIZE));
540
541 return_ACPI_STATUS(status);
542 }
543
544 mem_rover = acpi_tb_scan_memory_for_rsdp(table_ptr,
545 ACPI_EBDA_WINDOW_SIZE);
546 acpi_os_unmap_memory(table_ptr, ACPI_EBDA_WINDOW_SIZE);
547
548 if (mem_rover) {
549
550 /* Return the physical address */
551
552 physical_address +=
553 (u32) ACPI_PTR_DIFF(mem_rover, table_ptr);
554
555 table_info->physical_address =
556 (acpi_physical_address) physical_address;
557 return_ACPI_STATUS(AE_OK);
558 }
559 }
560
561 /*
562 * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh
563 */
564 status = acpi_os_map_memory((acpi_physical_address)
565 ACPI_HI_RSDP_WINDOW_BASE,
566 ACPI_HI_RSDP_WINDOW_SIZE,
567 (void *)&table_ptr);
568
569 if (ACPI_FAILURE(status)) {
570 ACPI_ERROR((AE_INFO,
571 "Could not map memory at %8.8X for length %X",
572 ACPI_HI_RSDP_WINDOW_BASE,
573 ACPI_HI_RSDP_WINDOW_SIZE));
574
575 return_ACPI_STATUS(status);
576 }
577
578 mem_rover =
579 acpi_tb_scan_memory_for_rsdp(table_ptr,
580 ACPI_HI_RSDP_WINDOW_SIZE);
581 acpi_os_unmap_memory(table_ptr, ACPI_HI_RSDP_WINDOW_SIZE);
582
583 if (mem_rover) {
584
585 /* Return the physical address */
586
587 physical_address = (u32)
588 (ACPI_HI_RSDP_WINDOW_BASE +
589 ACPI_PTR_DIFF(mem_rover, table_ptr));
590
591 table_info->physical_address =
592 (acpi_physical_address) physical_address;
593 return_ACPI_STATUS(AE_OK);
594 }
595 }
596
597 /*
598 * Physical addressing
599 */
600 else {
601 /* 1a) Get the location of the EBDA */
602
603 ACPI_MOVE_16_TO_32(&physical_address, ACPI_EBDA_PTR_LOCATION);
604 physical_address <<= 4; /* Convert segment to physical address */
605
606 /* EBDA present? */
607
608 if (physical_address > 0x400) {
609 /*
610 * 1b) Search EBDA paragraphs (EBDA is required to be a minimum of
611 * 1_k length)
612 */
613 mem_rover =
614 acpi_tb_scan_memory_for_rsdp(ACPI_PHYSADDR_TO_PTR
615 (physical_address),
616 ACPI_EBDA_WINDOW_SIZE);
617 if (mem_rover) {
618
619 /* Return the physical address */
620
621 table_info->physical_address =
622 ACPI_TO_INTEGER(mem_rover);
623 return_ACPI_STATUS(AE_OK);
624 }
625 }
626
627 /* 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh */
628
629 mem_rover =
630 acpi_tb_scan_memory_for_rsdp(ACPI_PHYSADDR_TO_PTR
631 (ACPI_HI_RSDP_WINDOW_BASE),
632 ACPI_HI_RSDP_WINDOW_SIZE);
633 if (mem_rover) {
634
635 /* Found it, return the physical address */
636
637 table_info->physical_address =
638 ACPI_TO_INTEGER(mem_rover);
639 return_ACPI_STATUS(AE_OK);
640 }
641 }
642
643 /* A valid RSDP was not found */
644
645 ACPI_ERROR((AE_INFO, "No valid RSDP was found"));
646 return_ACPI_STATUS(AE_NOT_FOUND);
647}
648
649#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-21 12:36:39 -0500